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java.lang.ArrayIndexOutOfBoundsException: 2 at java.util.Arrays$ArrayList.get( at$null$4( at$toMap$58( at$3ReducingSink.accept( at java.util.Spliterators$ArraySpliterator.forEachRemaining( at at at$ReduceOp.evaluateSequential( at at at$getRowsMappedToHeadings$5( at$3$1.accept(